I own a Vespa PX 2011 150cc and I am thinking to put the Sip Road exhaust http://www.sip-scootershop.com/en/products/racing+exhaust+sip+road+20+_24166200. I want to ask you if it is necessary to alter the jetting, as I am thinking not to do so at first, and keep the original jetting. What do you think?
you should definitely go to a bigger jet. i have a 2005 genuine stella (a.k.a. LML star) that had a sito+ and i went from a 100 main jet to a 106 main jet when i switched to the sip road.
Hi, you do need all this stuff (very important, otherwise you risk seizing!):
Have fun [;)]